Female characters are fine.
In a perfect world, I will be getting 7 people and each are a hero. Except one who will defect due to my character and partly on her end.
So, it would start as 3 males and 4 females. This would eventually give the group a gender ratio of 3 males and 3 females. Assuming people care about romantic interests. The female that comes with me will have a specific digimon and specific roles to play. I have other likes that would make it all interesting, but not a requirement.
Granted, while there are plenty of times for bonding, I really only see this as a plot heavy RP with little sexual aspects. Again, there can be, but nothing heavy early. You see, I am trying to make it sort of sandboxy until the plot points to let the hero do some adventuring and exploring as they are to reach their destination.
I just thought I would put that out there. It's slow, but not too bad for just to see who likes digimon. I mean 4, maybe 5 people is not bad. Again, only to see if people have an interest in digimon.